Global Magnetic Fields of Galaxies and Models for the Galactic Centers

1. 利用紊流扩散和星系气态盘中平均场的发电机再生，再现了螺旋星系中的双对称螺旋磁场。BSS磁场以波的形式在磁盘的大片区域上传播和旋转。发现BSS磁场图样的角速度近似等于螺旋密度波的角速度，因此这两个波之间发生了准共振磁重相互作用。螺旋密度波的产生和维持由BSS磁场控制。提出了一种计算旋转气体椭球在外力场中的非线性运动的数学方法。它被广泛应用于银河系潮汐力中磁化旋转气体云、中子星发射引力波等各种问题。在本研究中，我们跟踪了旋转星际气体云在引力收缩中的非轴对称大振幅振荡。我们现在正在寻找旋转气体云的剧烈振荡与恒星形成活动之间的可能关系。我们用最近邻近似法模拟了恒星和巨大分子云之间的引力相互作用。恒星被随机加速，但由此产生的动能主要用于在星系平面上系统地向内或向外迁移：只有一小部分能量被存储为局部星系圆周运动中随机运动的能量。的随机速度。50 kms<@D1-1@>D1可以通过与巨大分子云的引力相互作用再现，但大于或等于50 kms<@D1-1@>D1必须归因于其他尚未确定的机制。

1. Bisymmetric spiral (BSS) magnetic fields in spiral galaxies are reproduced by using turbulent diffusion and dynamo regeneration of mean fields in the galactic gaseous disk. The BSS magnetic fields progate and rotate as a wave over large area of the disk. The angular velocity of the BSS magnetic field pattern is found to be approximately equal to that of the spiral density wave, and thus the quasi-resonant magnetogravitational interaction occurs between these two waves. Generation and maintenance of the spiral density waves are controlled by the BSS magnetic fields.2. A mathematical technique is developed to follow nonlinear motions of rotating gaseous ellipsoids in external force fiels. It is widely applied to various problems such as magnetized rotating gaseous clouds in the galactic tidal force, neutron stars emitting gravitational waves etc.. In the present research program, we followed nonaxisymmetric large-amplitude oscillation of rotating interstellar gas cloud in gravitational contraction. We are now searching for a possible relation between this violent oscillation of rotating gas cloud and star formation activities.3. We have simulated gravitational interaction between stars and giant molecular clouds using the nearest neighbour approximation. Stars are randomly accelerated, but a resultant kinetic energy is used mostly to migrate systematically inward or outward on the galactic plane: Only a small portion of the energy is stored as that of the random motion on the local galactic circular motion. The random velocity of 【.Itorsim.】50 kms<@D1-1@>D1 of population I stars can be reproduced by the gravitational interaction with giant molecular clouds, but that【greater than or equal】 50 kms<@D1-1@>D1 must be due to other notyet-identified mechanisms.